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| Research on Wear Distribution and Wear Acceptance Criteria Optimization of In-core Neutron Flux Instrumentation System Thimble Tube |
| Received:May 27, 2021 Revised:July 21, 2021 |
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| DOI：10.7643/issn.1672-9242.2022.01.015 |
| KeyWord:NPP in-core neutron flux instrumentation system thimble tube wear distribution wear cause |
| Author | Institution |
| CAI Zhen |
Suzhou Nuclear Power Research Institute, Suzhou , China |
| MEI Jin-na |
Suzhou Nuclear Power Research Institute, Suzhou , China |
| WANG Peng |
Suzhou Nuclear Power Research Institute, Suzhou , China |
| TI Wen-xin |
Suzhou Nuclear Power Research Institute, Suzhou , China |
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| Abstract: |
| The purpose of this paper is to analyze the wear distribution of in-core neutron flux instrumentation system thimble tube and put forward suggestions for optimization of wear acceptance criteria. The research method in this paper is to analyze the wear distribution of thimble tube by counting the wear number of thimble tubes at different positions. And this paper analyzes wear causes of thimble tube by combined the design characteristics of thimble tube and guide card and video inspection results. Some suggestions of thimble tube wear acceptance criteria are given. There is obvious characteristics in wear distribution of thimble tube, which is the wear mainly concentrated in Point 1 and Point 4. And the wear at Point 1 is the most, while the wear at Point 2, Point 3 and Point 5 are less. The fretting wear behavior of high frequency and low amplitude with random direction is easy to occur at Point 1, which leads to narrow ring groove wear scars. The fretting wear behavior of low frequency and high amplitude is easy to occur at Point 4, which leads to wide wedge wear scars. The structural characteristics of thimble tube and guide card and reactor coolant flow field have a great influence on the thimble tube wear, and the wear defects of the thimble tube in different positions are greatly different. It is necessary to carry out related research to establish the wear acceptance criteria for the thimble tube at Point 1 and Point 4, respectively, so as to make the wear treatment of the thimble tube more targeted and prolong the service life of thimble tube. |
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